User Administration

So we want to help the publisher pick up a group of users (the object)
and then pick something to do with those users (the verb). Here's an
example:

"I am interested in users whose email address ends in "mit.edu" and who've
either posted at least one entry in the last six months into a particular
discussion forum or who have explicitly said that they're interested in
learning more about large format photography. Once I've seen how many
there are, I would like to spam them."

As different installations of the ACS will have different active modules
and different publisher interest, we actually need a way for a publisher
to formally specify "these are the kinds of ways I'd like to select out
users".
philg@mit.edu